Buggy code:
public class ProjectRestrictNode extends SingleChildResultSetNode { public ValueNode restriction ; ValueNode constantRestriction = null ; public PredicateList restrictionList ; SubqueryList projectSubquerys ; SubqueryList restrictSubquerys ; private boolean accessPathModified ; private boolean accessPathConsidered ; private boolean childResultOptimized ; private boolean materialize ; private boolean getTableNumberHere ; public void init ( Object childResult , Object projection , Object restriction , Object restrictionList , Object projectSubquerys , Object restrictSubquerys , Object tableProperties ) { } public boolean nextAccessPath ( Optimizer optimizer , OptimizablePredicateList predList , RowOrdering rowOrdering ) throws StandardException { } public void rememberAsBest ( int planType , Optimizer optimizer ) throws StandardException { } void printRememberingBestAccessPath ( int planType , AccessPath bestPath ) { } public void startOptimizing ( Optimizer optimizer , RowOrdering rowOrdering ) { } public int getTableNumber ( ) { } public CostEstimate optimizeIt ( Optimizer optimizer , OptimizablePredicateList predList , CostEstimate outerCost , RowOrdering rowOrdering ) throws StandardException { } public boolean feasibleJoinStrategy ( OptimizablePredicateList predList , Optimizer optimizer ) throws StandardException { } public AccessPath getCurrentAccessPath ( ) { } public AccessPath getBestAccessPath ( ) { } public AccessPath getBestSortAvoidancePath ( ) { } public AccessPath getTrulyTheBestAccessPath ( ) { } public void rememberSortAvoidancePath ( ) { } public boolean considerSortAvoidancePath ( ) { } public boolean pushOptPredicate ( OptimizablePredicate optimizablePredicate ) throws StandardException { } public void pullOptPredicates ( OptimizablePredicateList optimizablePredicates ) throws StandardException { } public Optimizable modifyAccessPath ( JBitSet outerTables ) throws StandardException { } private Optimizable replaceWithHashTableNode ( ) throws StandardException { } public void verifyProperties ( DataDictionary dDictionary ) throws StandardException { } public boolean legalJoinOrder ( JBitSet assignedTableMap ) { } public double uniqueJoin ( OptimizablePredicateList predList ) throws StandardException { } PredicateList getRestrictionList ( ) { } String getUserSpecifiedJoinStrategy ( ) { } public void printSubNodes ( int depth ) { } public ResultSetNode preprocess ( int numTables , GroupByList gbl , FromList fromList ) throws StandardException { } public void pushExpressions ( PredicateList predicateList ) throws StandardException { } public ResultSetNode addNewPredicate ( Predicate predicate ) throws StandardException { } public boolean flattenableInFromSubquery ( FromList fromList ) { } public ResultSetNode ensurePredicateList ( int numTables ) throws StandardException { } public ResultSetNode optimize ( DataDictionary dataDictionary , PredicateList predicates , double outerRows ) throws StandardException { } public CostEstimate getCostEstimate ( ) { } public CostEstimate getFinalCostEstimate ( ) throws StandardException { } public void generate ( ActivationClassBuilder acb , MethodBuilder mb ) throws StandardException { } public void generateResultSet ( ExpressionClassBuilder acb , MethodBuilder mb ) throws StandardException { } private void generateMinion ( ExpressionClassBuilder acb , MethodBuilder mb , boolean genChildResultSet ) throws StandardException { } boolean nopProjectRestrict ( ) { <START_BUG> if ( ( ( restriction ) != null ) || ( ( ( restrictionList ) != null ) && ( ( restrictionList . size ( ) ) > 0 ) ) ) { <END_BUG> return false ; } ResultColumnList childColumns = childResult . getResultColumns ( ) ; ResultColumnList PRNColumns = this . getResultColumns ( ) ; if ( PRNColumns . nopProjection ( childColumns ) ) return true ; return false ; } public void generateNOPProjectRestrict ( ) throws StandardException { } public ResultSetNode considerMaterialization ( JBitSet outerTables ) throws StandardException { } protected FromTable getFromTableByName ( String name , String schemaName , boolean exactMatch ) throws StandardException { } public int updateTargetLockMode ( ) { } boolean isPossibleDistinctScan ( Set distinctColumns ) { } void markForDistinctScan ( ) { } public Visitable accept ( Visitor v ) throws StandardException { } public void setRefActionInfo ( long fkIndexConglomId , int [ ] fkColArray , String parentResultSetId , boolean dependentScan ) { } public void setRestriction ( ValueNode restriction ) { } }

Fix:
if ( ( ( ( restriction ) != null ) || ( ( constantRestriction ) != null ) ) || ( ( ( restrictionList ) != null ) && ( ( restrictionList . size ( ) ) > 0 ) ) ) {